Leersia hexandra

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Leersia hexandra
Leersia hexandra 2.jpg
Status TNC G5.svg
Secure  (NatureServe)
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Poaceae
Genus: Leersia
Species:
L. hexandra
Binomial name
Leersia hexandra
Sw.
Synonyms
Synonyms [1] [2]
  • Asprella australis
  • Asprella brasiliensis
  • Asprella hexandra
  • Asprella mexicana
  • Blepharochloa ciliata
  • Homalocenchrus angustifolius
  • Homalocenchrus gouinii
  • Homalocenchrus hexandrus
  • Hygroryza ciliata
  • Leersia abyssinica
  • Leersia aegyptiaca
  • Leersia angustifolia
  • Leersia australis
  • Leersia brasiliensis
  • Leersia capensis
  • Leersia ciliaris
  • Leersia ciliata
  • Leersia compressa
  • Leersia contracta
  • Leersia dubia
  • Leersia elongata
  • Leersia ferox
  • Leersia glaberrima
  • Leersia gouinii
  • Leersia gracilis
  • Leersia griffithiana
  • Leersia luzonensis
  • Leersia mauritanica
  • Leersia mauritiaca
  • Leersia mexicana
  • Leersia parviflora
  • Oryza australis
  • Oryza hexandra
  • Oryza mexicana
  • Pharus ciliatus
  • Pseudoryza ciliata
  • Zizania ciliata

Leersia hexandra is a species of grass known by the common names southern cutgrass, clubhead cutgrass, and swamp rice grass. [3] It has a pantropical distribution. [4] It is also an introduced species in many regions, sometimes becoming invasive, and it is an agricultural weed of various crops, [3] especially rice. [5] It is also cultivated as a forage for livestock. [6]

Contents

Description

This species is a perennial grass growing from rhizomes and stolons. The hollow stems are decumbent and creeping and root easily where their nodes contact the substrate. They produce erect shoots that can exceed one meter tall. [3] [7] It is an aquatic or semi-aquatic grass, and the erect stem parts may float in water. [8] These stems can grow densely in aquatic habitat and become matted, forming what are often referred to as "carpets". [3] [5] [9]

The leaf sheath has a fleshy base covered in white hairs and the ligule can be stiff and dry, [3] becoming "papery". [10] The leaves have sharp-pointed blades up to 30 centimeters long which are flat or rolled, the edges sometimes rolling at night or when the blade dries. [3] The blades are sometimes hairless, [8] but are usually coated in very rough hairs, making them so rough to the touch that they are "unpleasant to handle". [6] They also have very sharp edges, [10] and the midrib has backward-facing, spiny hairs that give it a cutting edge. The "retrorsely spinulose midrib of the leaf can inflict most painful lacerations". [9]

The panicle is narrow or spreading and erect or nodding, and up to about 12 centimeters long. The branches are almost fully lined with overlapping spikelets each up to half a centimeter long. [3] The spikelets may be greenish or purplish in color, [7] or sometimes tinged with orange or brick red. [6] They are surrounded by white or purplish bracts that have characteristic comb-like hairs along their greenish nerves. [3] The flower has six stamens. [7] After the spikelets fall, the panicle branches have a zig-zag shape. [6] Fertile seed is rarely produced and the grass commonly reproduces vegetatively by sprouting from the rhizome or the nodes on the stem. [3] Large stands of the grass are often clones. [5]

This grass looks very similar to rice and other species of the genus Oryza . It is a member of the rice tribe Oryzeae and sometimes grows in rice paddies. [5]

Ecology

This plant grows in shallow freshwater habitat and on wet and moist land. It can be found in marshes, swamps, ponds, irrigation ditches, flooded rice fields, and on other moist agricultural land and floodplains. It is mostly tropical, but it can grow in some temperate climates. [3] It can persist for a time in drier conditions during drought. [6]

The grass provides food and shelter for animals. Many water birds feed on it. [10] In Tanzania it is a dominant plant in the swamps where the shoebill (Balaeniceps rex) and wattled crane (Bugeranus carunculatus) build their nests. [11] On the Llanos of Colombia and Venezuela it is the second most important food of the resident herds of capybara (Hydrochoerus hydrochaeris), composing up to 29% of their diet. [6]

It is one of the two host plants of the brown planthopper (Nilaparvata lugens), the other being cultivated rice. While it has been observed on many other plant species, it can only complete its life cycle on cutgrass or rice. There are two strains of the planthopper, one that only lays eggs on rice and one that favors cutgrass; the rice strain does not effectively reproduce on cutgrass and vice versa, even when sympatric. While they can be crossed in laboratory tests, the two strains do not interbreed in the wild. [12]

As a weed

Spikelets Leersia hexandra spikelets.jpg
Spikelets

The grass is a weed of several crops, including tea, rubber, maize, and sugarcane, but especially rice. It is a relative of the rice plant and it thrives in paddy fields. Its vegetation "carpets" clog irrigation waterways, causing flooding and erosion. It hosts many rice pests, including the brown planthopper, the green planthopper (Nilaparvata bakeri), the green rice leafhopper (Nephotettix malayanus), the rice gall midge (Orseolia oryzae), and the moth Helcystogramma arotraeum . [5] It hosts the rice stem nematode, which causes ufra disease of rice. [5] It is susceptible to many plant viruses that infect rice plants, such as rice grassy stunt virus, rice transitory yellowing virus, and rice tungro virus. [13] It is susceptible to bacteria and fungi such as pathogenic Xanthomonas oryzae , which causes leaf blight of rice, and Cochliobolus miyabeanus , which causes brown spot. [5]

Uses

Despite its sharp leaf edges, the grass is palatable to cattle and it is maintained as a pasture grass on swampy land and cut for hay. [6]

This species is a hyperaccumulator of heavy metals, with the ability to take up large amounts of chromium, copper, and nickel from water and soil. [14] Its ability to absorb chromium in particular has been described as "extraordinary". [15] [16] It is considered to be a potential agent of phytoremediation in efforts to clean up metal-contaminated soils and water. [15] Targets could include industrial wastewater, such as that discharged from electroplating factories, [14] and the contaminated soils around such facilities. [15]

Related Research Articles

Shoebill Species of bird

The shoebill also known as whalehead, whale-headed stork, or shoebill stork, is a very large stork-like bird. It derives its name from its enormous shoe-shaped bill. It has a somewhat stork-like overall form and has previously been classified with the storks in the order Ciconiiformes based on this morphology. However, genetic evidence places it with pelicans and herons in the Pelecaniformes. The adult is mainly grey while the juveniles are browner. It lives in tropical east Africa in large swamps from South Sudan to Zambia.

<i>Echinochloa frumentacea</i> Species of grass

Echinochloa frumentacea is a species of Echinochloa. Both Echinochloa frumentacea and E. esculenta are called Japanese millet. This millet is widely grown as a cereal in India, Pakistan, and Nepal. Its wild ancestor is the tropical grass Echinochloa colona, but the exact date or region of domestication is uncertain. It is cultivated on marginal lands where rice and other crops will not grow well. The grains are cooked in water, like rice, or boiled with milk and sugar. Sometimes it is fermented to make beer. While also being part of staple diet for some communities in India, these seeds are, in particular, eaten during religious fasting. For this reason, these seeds are commonly also referred to as "vrat ke chawal" in Hindi. Other common names to identify these seeds include oodalu (ಊದಲು) in Kannada, Shyamak (শ্যামাক) or Shyama Chal in Bangla, jhangora in the Garhwal Hills, bhagar (भगर) in Marathi-speaking areas, samo or morio seeds in Gujerati, or kuthiraivaali (குதிரைவாளி) in Tamil.

Brown planthopper Species of true bug

The brown planthopper (BPH), Nilaparvata lugens (Stål) is a planthopper species that feeds on rice plants. These insects are among the most important pests of rice, which is the major staple crop for about half the world's population. They damage rice directly through feeding and also by transmitting two viruses, rice ragged stunt virus and rice grassy stunt virus. Up to 60% yield loss is common in susceptible rice cultivars attacked by the insect. The BPH is distributed throughout Australia, Bangladesh, Bhutan, Burma (Myanmar), Cambodia, China, Fiji, India, Indonesia, Japan, North and South Korea, Laos, Malaysia, India, Nepal, Pakistan, Papua New Guinea, Philippines, Sri Lanka, Taiwan, Thailand, and Vietnam. Their alternative host plant other than rice is Leersia hexandra.

<i>Hordeum jubatum</i> Species of flowering plant

Hordeum jubatum, with common names foxtail barley, bobtail barley, squirreltail barley, and intermediate barley, is a perennial plant species in the grass family Poaceae. It occurs wild mainly in northern North America and adjacent northeastern Siberia. However, as it escaped often from gardens it can be found worldwide in areas with temperate to warm climates, and is considered a weed in many countries. The species is a polyploid and originated via hybridization of an East Asian Hordeum species with a close but extinct relative of Californian H. brachyantherum. It is grown as an ornamental plant for its attractive inflorescences and when done flowering for its infructescence.

Magnaporthe salvinii is a fungus known to attack a variety of grass and rice species, including Oryza sativa and Zizania aquatica. Symptoms of fungal infection in plants include small, black, lesions on the leaves that develop into more widespread leaf rot, which then spreads to the stem and causes breakage. As part of its life cycle, the fungus produces sclerotia that persist in dead plant tissue and the soil. Management of the fungus may be effected by tilling the soil, reducing its nitrogen content, or by open field burning, all of which reduce the number of sclerotia, or by the application of a fungicide.

Rice ragged stunt virus (RRSV) is a plant pathogenic virus of the family Reoviridae.

<i>Festuca perennis</i> Species of flowering plant

Festuca perennis is a ryegrass native to temperate Europe, though its precise native range is unknown.

<i>Leersia</i> Genus of plants

Leersia is a genus of plants in the grass family which includes species known generally as cutgrasses.

<i>Leersia oryzoides</i> Species of plant

Leersia oryzoides is a species of grass known by the common name rice cutgrass or just cut-grass. It is a widespread grass native to Europe, Asia, and North America and present in many other regions, such as Australia, as an introduced species. This is a rhizomatous perennial grass growing to a maximum height between 1 and 1.5 meters. The leaves are up to about 28 centimeters long and have very rough, minutely toothed edges. The inflorescence is a loose, open array of wavy, hairlike branches bearing rows of spikelets. Each spikelet is a flat fruit with a rough, bristly lemma without an awn, and no glumes. Some of the spikelet branches develop within the sheaths of the leaves and are cleistogamous. This grass is sometimes used for erosion control and restoring wetlands.

<i>Leersia virginica</i> Species of flowering plant

Leersia virginica, commonly known as whitegrass, white cutgrass, or Virginian cutgrass, is a perennial grass that is native to eastern North America, typically found in partially shaded low-lying wet areas.

<i>Scirpus ancistrochaetus</i> Species of grass-like plant

Scirpus ancistrochaetus is a rare species of flowering plant in the sedge family known by the common names barbedbristle bulrush and northeastern bulrush. It is native to the northeastern United States from New Hampshire south to Virginia. It used to be found in Quebec but it is now thought to be extirpated there. It was also believed extirpated from the state of New York, but at least one population has been rediscovered in Steuben County in 2010. It is threatened by the loss and degradation of its wetland habitat. It is a federally listed endangered species.

<i>Zizania texana</i> Species of grass

Zizania texana is a rare species of grass known by the common name Texas wild rice. It is endemic to Texas, where it is found only on the upper San Marcos River in Hays County. It is threatened by the loss and degradation of its habitat. It is a federally listed endangered species of the United States.

<i>Eragrostis intermedia</i> Species of grass

Eragrostis intermedia is a species of grass known by the common name plains lovegrass. It is native to North and Central America, where it is distributed from the southeastern and southwestern United States south to Costa Rica. Its range may extend to South America.

<i>Zizaniopsis miliacea</i> Species of plant in the family Poaceae

Zizaniopsis miliacea is a species of flowering plant in the grass family, Poaceae. It is known by the common names giant cutgrass, water millet, and southern wildrice. The name giant cutgrass refers to the plant's large, rough-edged leaves, and the name southern wildrice refers to its resemblance to wildrice. It is native to the southeastern United States and it can also be found in central Mexico.

<i>Dichanthium annulatum</i> Species of plant

Dichanthium annulatum is a species of grass. It is commonly used as a forage for livestock.

<i>Digitaria didactyla</i> Species of flowering plant

Digitaria didactyla is a species of grass known by the common names blue couch, Queensland blue couch, blue serangoon grass, green serangoon grass, blue stargrass, and petit gazon. It is native to Mauritius, Réunion, parts of mainland Africa, and Madagascar. It has been introduced widely outside its native range, mainly for use as a pasture and turf grass. It has naturalized in some regions.

<i>Eragrostis pilosa</i> Species of plant

Eragrostis pilosa is a species of grass. It is native to Eurasia and Africa. It may or may not be native to North America. It is widely introduced, and it is a common weed in many areas.

<i>Setaria palmifolia</i> Species of grass

Setaria palmifolia is a species of grass known by the common names palmgrass, highland pitpit, hailans pitpit, short pitpit, broadleaved bristlegrass, and knotroot. In Spanish it is called pasto de palma and in Samoan vao 'ofe 'ofe. It is native to temperate and tropical Asia. It is known elsewhere as an introduced, and often invasive, species, including in Australia, New Zealand, many Pacific Islands, and the Americas.

<i>Hyparrhenia rufa</i> Species of plant

Hyparrhenia rufa is a species of grass known by the common names jaraguá, jaraguá grass, and giant thatching grass. It is native to Africa and it is widespread in the world as a cultivated forage and fodder for livestock and a naturalized and sometimes invasive species.

<i>Xanthomonas oryzae</i> pv. <i>oryzae</i> Variety of bacteria

Xanthomonas oryzae pv. oryzae is a bacterial pathovar that causes a serious blight of rice, other grasses, and sedges.

References

  1. Leersia hexandra. Integrated Taxonomic Information System (ITIS).
  2. Leersia hexandra. The Plant List.
  3. 1 2 3 4 5 6 7 8 9 10 Leersia hexandra. Pacific Island Ecosystems at Risk (PIER).
  4. "Leersia hexandra". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 14 January 2018.
  5. 1 2 3 4 5 6 7 CABI. (2013). Leersia hexandra. In: Invasive Species Compendium. Wallingford, UK: CAB International.
  6. 1 2 3 4 5 6 7 Leersia hexandra. FAO.
  7. 1 2 3 Leersia hexandra. Flora of China.
  8. 1 2 Pyrah, G. L. Leersia hexandra. Archived 2013-11-06 at the Wayback Machine Grass Manual. Flora of North America.
  9. 1 2 Leersia hexandra. In: Flora of West Tropical Africa vol. 3, part 2. 1972. JSTOR Global Plants.
  10. 1 2 3 Leersia hexandra. Center for Aquatic and Invasive Plants. University of Florida IFAS.
  11. John, J. R., et al. (2012). Observations on nesting of shoebill Balaeniceps rex and wattled crane Bugeranus carunculatus in Malagarasi wetlands, western Tanzania. African Journal of Ecology 51(1), 184-87.
  12. Sezer, M. and R. K. Butlin. (1998). The genetic basis of oviposition preference differences between sympatric host races of the brown planthopper (Nilaparvata lugens). Proceedings of the Royal Society of London. Series B: Biological Sciences 265(1413), 2399-2405.
  13. Abo, M. E. and A. A. Sy. (1997). Rice virus diseases: epidemiology and management strategies. Journal of Sustainable Agriculture 11(2-3), 113-34.
  14. 1 2 You, S., et al. (2013). Feasibility of constructed wetland planted with Leersia hexandra Swartz for removing Cr, Cu and Ni from electroplating wastewater. Environmental Technology in press.
  15. 1 2 3 Zhang, X. H., et al. (2007). Chromium accumulation by the hyperaccumulator plant Leersia hexandra Swartz. Chemosphere 67(6), 1138-43.
  16. Liu, J., et al. (2009). Subcellular distribution of chromium in accumulating plant Leersia hexandra Swartz. Plant and Soil 322(1-2), 187-95.